ci: build riscv64 wheel on RISE runner via uv

[gounthar]

The scheduled Build riscv64 wheel run #25982742827 built the wheel fine but the release job failed: it targets the self-hosted F3 board ([self-hosted, linux, riscv64]) and was never acquired (cancelled after multiple attempts). That board is shared by several fork builds and contends weekly.

This fork is not redundant: openai-harmony ships no riscv64 wheels on PyPI (0.0.8 has arm64/aarch64/x86_64 etc., not riscv64) and upstream openai/harmony#98 ("Add riscv64") is still open. This build is the only riscv64 wheel source, so the fix is reliability, not removal.

Change (mirrors the watchfiles / safetensors / orjson fixes)

• build -> runs-on: ubuntu-24.04-riscv (RISE native runner) + astral-sh/setup-uv + uv venv --python 3.12, matching the sibling httptools build that runs there green. maturin/venv flow otherwise unchanged (--manifest-path Cargo.toml preserved).
• release -> runs-on: ubuntu-latest (only downloads the artifact + creates a release; no riscv64 needed). This is the job that failed today.
• Corrected the now-inaccurate "Built on: BananaPi F3" release note to "RISE riscv64 runner".

Workflow is active, so no re-enable needed. The next scheduled run validates end-to-end.

[gemini-code-assist]

Note

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9f2de9a4-735f-48cb-b5c5-81031f56fdf5

📥 Commits

Reviewing files that changed from the base of the PR and between 6541fdf and 50032c4.

📒 Files selected for processing (1)

• .github/workflows/build-riscv64.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/riscv64-build-reliability

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